Gear-cutting machine.



H. A. GARVEY. GEAR CUTTING MACHINE. APPLICATION FILED JUNE 24. 1913.

3 SHEETSSHEET I.

Patented Jan. 2, 1917.

H. A. GARVEY. GEAR CUTTING MACHINE. APPLICATION FILED JUNE 24. 2913.

3 SHEETSSHET 2.

H. A. GAHVEY. GEAR cu'nms MACHINE. APPLICATION FILED JUNE 24. i913.

Patented Jan. 2,1917.

3 SHEETS-SHEET 3- 3 is an elevation of A. GAEVEY, 015 DETROIT, lvii fil' lflhl', ASSZCGNOE T PACKARH MOTOR CAB HENRY COMEAIKY. 011' DETROIT, EIEICLIQiA'N, A no.

LGEATIOH OF MICHIGAN.

GEAR-CUTTING INIELCHIR'E.

Specification of "Letters Patent.

Patented Jan. 2, 1217.

Application filed June 1818. Serial Isle. 775,558.

To all whom it may concern:

fie it known that I, HENRY A. Garve a citizen of the United States, and resident of -Detro1t, l/Vayne county,

State of Michigan, have invented certain new and useful Iniprovernents in Gear-Cutting Machines, of which the following is a specification.

This invention relates to gear cutting inachines and more particularly to certain improvements whereby bevel gears having curved teeth areadapted to be cut on these machines.

I ()ne of the objects of the invention is to provide a simple, rigid construction for moving the tool accurately in a curved path.

Another object is to provide a construction which is not subject to excessive wear.

Another object is to provide a construction in which the angle of the teeth cut may be varied.

Other objects and the features of novelty Will be apparent from the following descrip tion, taken in connection with the drawing, in which:

Figure 1 is a fragmentary plan view oi the tool operating mechanism of a gear cutting machine embodying my improvements; Fig. 2 is a front elevation of the same; Fig. the left hand side of Fig. 2; Fig. i raginentary section on larged sectional. view of the shaft for lifting the tool on tae return stroke. I

Referring to the drawings 1.0 indicates the loed of the machine on which slides a ram ll, suitable guides 12 being provided for the rain. At its forward end the rain 11 carries a head 12 having a slide-way l3 .l'or a tool support 14. the slide-way being arranged at right angles to the direclion of movement of the rain. Any suitable means may be provided for securing the tool support 14 in the slide-way l3 and for this purpose-l prefer to use the usual dovetail on the tool support and form the slulc-way to suit this dovetail, as indicated in dotted lines in Fig. 3. The tool support carries a rock shaft 15 which has se ured thereto, by means or a pin 16. a tool holder 17. 'lhc tool holder 17 has a forwardly projecting arm 18 which rarries the tool and the urn; l8 arranged hotwecn suitable guides 12? on the tool support.

iiie rain 11 ca. it-s a wrist pin 20 which is operatirely connected with a crank pin 21 by means oi a connect ng rod 22. The crank pin 21 is adjustably secured in any well known way in the transverse slot in the end oi' the hub 2i o1 a driving wheel 25, this driving wheel being arranged on a driving shaft 26, which is supported in suitable hearings (not shown). The mechanism for reciprocating the rain 11, just described, is well known and forms no part of the present invention.

For the purpose of guiding the tool T in the arc of a circle I arrange on one side of the tool support 14- ears 2? to which an arm or link 28 is connected as by means of a suit able pivot pin 29. The arm or link 255 is also connected with a normally fixed pivot 80 which is arranged at one side of: and slightly in advance of the pivot 29, as clearlyshown in Fig. 1. The pivot 30 is carried by ears 31 on a wedge block 32, this wedge block being are shaped and supported in a guide The guide 33 is carried by a table on a suitable bracket 35 secured to the frame 10. Above the guide 33 is a guide 36 which engages the block 32 and is adapted to be 'clainped against the latter by means of screws 37. The guides and 36 are arc sh apcd, as shown in Fig. 1, and have secured thereto the end plates 38 and 39 which carry adjusting screws 40 and =fll, respectively. These screws engage the ClHlS oi? the block and are for the purpose of adjusting the latter in the guides and 36.

For the purpose ol raising the tool out of the tooth space on the returnstroke of the ram, I arrange on one end ol' the shaft 15 a linger 42 which is adapted to be engaged by a. finger 43 on a shaft 44. From the drawings it will be obvious that when thcshai't ll is rocked the finger 42 will be li lied and thus rock the shaft 15. holder 17 will be lifted by rocking the shalt l5 azul thereby carry with it the tool T, to a suillclcut height to lift the latter out of the The arm 15 oi the tool 9 tooth space of the ,{car which is being cut.

and meshes with a bevel gear 48'which is also rotatably mounted in a suitable bearing; in the head 12. The other end. of the shaft 44 is provided with a recess 49 which receives a stud 50 carried by the tool support 14.

Owing to the sliding movement which the tool support 14 has relative to the head 12,

it is necessary to spline the shaft 44 to the gear 45, and for the purpose of connecting the shaft 44 with the stud 50 in such a manner aSto permit rotation of the shaft relative to the stud, I provide the recess 49 with annular grooves 51 and 52 which are adapted to receive the ends of the pins 53 carried in suitable recesses 54 in the stud 50. In order to hold the ends of the pins 53 in the grooves 51 and 5;. springs 55 are provided in the recesses back of the pins For the purpose of facilitating the removal of the shaft 44 from the stud f t) I provide the shaft with openingsv so which communicate with the grooves 51 and 52, as shown in Fig. 5, and permit the insertion of a device for pushing the pins 53 out of the grooves.

A shaft 57 is mounted in a bearing 58 carried by the frame 10 and is splined in the gear 48. The shaft 57 carries a bevel gear 59 which meshes with a segmental bevel gear 0 arranged on one arm of a rocking lever 61. The lever (31 is pivotally mounted at 62 on a suitable bracket 3 and carries a cam roller 64, which is arranged in a cam groove (35 in the side of the driving wheel The cam groove 65 is of such shape as to give .the proper rocking movement to the shafts 44 to lift the tool T out of the tooth space when the ram starts on its return stroke.

It will be seen that the mecl'ianism for lifting the tool out of the tooth space is comparatively simple and does not interfere in any way with the operation of the tool support.

In order to insure the return of the tool holder to the proper position for the for ward or cutting stroke, I arrange on the arm 18 a laterally projecting post 66 to which is connected one end of a spring 67, the other end of this spring being secured to the post 68 on the tool support.

For the purpose of effecting a relative adjustment of the pivot 30 and the blank support to thereby vary the angle of the cut, I

have provided the means for adjusting the block 32. It will be evident that the path of movement of the tool will depend on the relation of the pivotSO to the pivot 29 and by shifting the block by means of the screws 40 and 41 the pivot 30 which is carried by the block 32 will be adjusted relative to the pivot 29. When the pivot 30 is in the proper position the screws 37 are tightened and the block 32 thus clamped. The block 32 is formed on an are about the pivot 29 so that during the adjustment of the block the posi- .port 14 to move back and forth across the G head 12, the pivot 29 which is carried by the tool support moving in an are or oscillating" about the pivot 30 as a center. The parts carried by the tool support 14 will move with it and the whole support will therefore move in a curved path, the motion being one of pure translation.

It will be observed that the path of any point of the tool, while making a complete cut across the face of the gear is a curve in a horizontal plane; and that the axis of the pivot 30 is perpendicular to the plane determined by said curved path. Hence as the above stated relation holds for each and every point of the tool, it may be said that the axis of the pivot is perpendicular to the plane determined by the curve of the cut. illoreover, if a plane is passed through an element in the surface of the face of the gear blank, tangential to the face, and the element istaken through the point where the tool is beginning a cut, it will be noted that the axis of the pivot is substantially perpendicular to such a plane. That is to say, the axis of the pivot is sunbstantially perpendicular to a plane tangential to the face of the blank where the cut is,being made.

lVhile I have shown and described what I now considerto be the preferred form of my invention, it will be understood that various changes can be made in the details of construction within the scope of the claims, and therefore I do not Wish to be limited to the exact details shown and described.

Having thus described my invention, what I claim is:

1. In a gear cutting machine, the combination of a frame, a reciprocating ram on the frame, a tool support slidably mounted on the ram, a link connected with a normally fixed pivot, and a pivotal connection between said link and said support 2. In a gear cutting machine, the combination of a frame, a reciprocating ram on the frame, a tool support arranged to slide on the ram transversely of the line of movement thereof, a link connected with a normally fixed pivot, and a pivotal connection between said link and said support.

3. In a gear cutting machine, the combination of a frame, a reciprocating ram on the frame, a tool support arranged to slide on the ram at right angles to the direction of movement thereof, a link connected with a normally fixed pivot, and a pivotal connection between said link and 'said' support.

4. In a gear cutting machine. the combt nation of a frame, a reciprocating ram on the frame, a toolv support slidablyimounted on the ram, an adjustable, normally fixedpivot, a link connectedwith said pivot, and a pivotal connection between said link and said support. v

5. In a gear cutting machine, the combination of a frame, a reciprocating rain on the frame, a tool support arranged to slide on the ram at right angles to the line of movement thereof, an adjustable, normally fixed pivot, a link connected with said pivot, and a pivotal connection between said link and said support.

6. In a gear cutting machine, the combination of a frame, a reciprocating ram on the frame, a tool support slidably mounted on the ram, a member adjustable along the arc of a circle, a link pivotally connected with said member, and a pivotal connection between said link and said support.

7. In a gear cutting machine, the combination of a frame, a reciprocating ram on the frame, a tool support slidably mounted on the ram, a normally fixed pivot, a link connected with said pivot, a pivotal connection between said link and said support, and means for adjusting said normally fixed pivot about said pivotal connection as a center.

8. In a gear cutting machine, the combination of a frame, a reciprocating ram on the frame, a tool support slidably mounted on the ram, a normally fixed member provided with a pivot, a link connected with said pivot, a pivotal connection between said link and said support, and a pair of opposed screws for adjusting the position of said member.

9. In a gear cutting machine, the combination of a frame, means forsupporting the gear blank, a pivot on said frame, a tool supporting member adapted to oscillate about said pivot in making the cut, and means whereby a relative adjustment of said pivot and said blank support may be effected.

10. In a gear-cutting machine, the combination of a frame, means for supporting a gear blank, a pivot on said frame, a toolsupporting member movable with reference to said pivot so as to effect a curved cut across the face of the blank in the form of a circular arc, and means whereby a relative adjustment of said pivot and said blank support may be effected 11. In a gear-cutting machine, the combination of a frame, means for supporting a gear blank, a pivot on said frame, a toolsupporting member movable with reference to said pivot so as to effect a curved cut across the face of the blank in the form of a circular are, means for moving the blank the arm on said pivot to cause the tool supporting member to move in a curved path.

13. In a gear cutting machine, the combination with the frame and means for supporting the blank, of a tool supporting member, a pivot on the frame, an arm mounted on said pivot and connected to the tool support, and means connected to the tool support to move the latter back and forth and causing an oscillation of said arm, whereby the tool support is caused to move in a curved path, for the purpose described.

14. In a gear cutting machine, the combination with the frame and means for sup- 7 porting the blank, of a tool supporting memher, a pivot on the frame, an arm mounted on said pivot and connected to the too. support, and means having a sliding connection with the tool support to move the. latter back and forth, whereby the tool support is caused to move in a translatory path.

15. In a gear cutting machine, the combination of a frame, means for supporting a gear blank, a tool supporting member, a pivot on said frame, means including said pivot for constraining said member to movement in a curved path, whereby a curved cut may be made across the fac of the blank on said supporting means, the axis of said pivot being perpendicular to the plane determined by the curve of said cut.

16. In a gear cutting machine, the combination of a frame, means for supporting a gear blank to be cut, a pivot on said frame substantially perpendicular to a plane tangential to the face of the blank where the cut is being made, a tool supporting member movable with reference to said pivot so as to effect a curved cut in the blank in the form of a circular arc and means whereby a relative adjustment of said pivot and said blank support may be effected.

In testimony whereof I afiix my signature in presence of two witnesses.

HENRY A. GARVEY.

Witnesses:

Ln ROI J. \VILLIAMS, E. GRoA'r. 

